help with a 90g overflow setup

[scooter6991]

I just bought a 90g perfecto overflow tank and it came with the overflow kit which was just the 2 tubes that go into the tank. im going to put a 20g under the tank for the overflow but my question is where do i get the tubes for under the tank that go into the 20g and keep the water flowing. any help that anyone can provide would be greatly appriciated.
thanks

 

[jrod4u]

Home depot or lowes, or anywhere they have plumbing supplies.